The invention relates to a brush holder.
The practice of placing the carbon brushes which are used in a commutator motor for contacting the rotating commutator in a brush holder is already known. In these holders the brushes are connected to a spring which pushes the brush towards the commutator in each case. During assembly a retaining device makes sure that the respective carbon brush remains in an assembly position in which it is at a desired distance from the commutator. At the end of assembly the retaining device is released, so that the carbon brush is pushed by the force of the spring towards the commutator and contacts the latter. The brush holders are attached to a brush carrier. This attachment is undertaken for example using an ultrasound welding process or by means of hot stacking.
An example of a brush holder from the applicant, which is attached to a brush plate, is shown in
The brush holder 2 shown in this figure features fastening lugs 7 and 8, which are provided with a punched out section 7c, 8c in each case. Melted material 3, 4 is introduced into this punched out section during ultrasound welding or during hot stacking which, after cooling off, takes care of the desired attachment of the brush 2 on the brush plate 1.
The brush holder 2 shown in
The brush holder 2 involves a one-piece stamped and bent part made of sheet brass, steel or copper which has been manufactured by automatic stamping and bending machines.
The contacting opening 10 provided on the upper side of the brush holder housing 2a can also be seen from
It has been shown that with hot stacking or ultrasound welding process melted material can penetrate in an undesired manner through this slit 9 into the interior of the brush holder housing 2a, solidifies there and during subsequent operation hinders movement of the carbon brush within the brush housing.
According to an embodiment, a brush holder, may comprise a brush holder housing and at least one attachment lug projecting sideways from the brush holder housing, wherein the attachment lug has an upwards bend and a return part extending up to the outer side of the brush holder housing.
According to a further embodiment, the brush holder may comprise two attachment lugs projecting sideways from the brush holder housing, each of which has an upwards bend and a return part extending to the outer side of the brush holder housing. According to a further embodiment, the attachment lugs each may comprise two congruent punched-out sections located above one another. According to a further embodiment, the brush holder can be made of sheet brass, steel or copper. According to a further embodiment, the brush holder can be a one-piece component. According to a further embodiment, the brush holder may be manufactured by a stamping and bending machine. According to a further embodiment, in the area in which the attachment lugs come out of the brush holder housing the attachment lugs may comprise a slit in each case, which is covered by the return part of the respective attachment lug on the outer side of the brush holder housing.
According to yet another embodiment, a method for manufacturing a brush holder, with a brush holder housing and at least one attachment lug projecting sideways from the brush holder housing, by means of a stamping and bending process, may comprise: in the stamping and bending process the attachment lug is bent upwards and returned to the outer side of the brush holder housing.
Further advantageous characteristics of the invention emerge from the subsequent explanation of the invention which refers to
The advantages of the invention lie especially in the fact that melted material produced during a hot stacking or ultrasound welding process is not able to get into the inside of the brush holder housing and solidify there. As a result the movement of the carbon brushes in the brush holder housing is not impeded during operation by solidified melted material. This advantage is attributable to the fact that inventively the attachment lugs of the brush holder are provided with a bend section in case and feature a return part which extends to the outer side of the brush holder housing 2a and covers the slit 9 of the brush holder housing resulting from the manufacturing process. This means that it is not possible for escaping melted material to get into the slit 9.
The attachment lug 7 is embodied longer than the one for the brush holder shown in
The brush holder according to an embodiment shown in
The attachment lug 8 provided on the other longitudinal side of the brush holder housing 2a has an upwards bend 8a and a return part 8b extending up to the outer side of the brush holder housing 2a. Furthermore the attachment lug 8 is equipped with congruent punched out sections 8c located above one another, through which during attachment of the brush holder to a brush plate, i.e. during hot stacking or ultrasound welding, melted material can be introduced which then solidifies and brings about the desired attachment.
The advantages of the invention not only lie in the fact that no melted material can get into the inside of the brush holder during hot stacking or ultrasound welding, but also in the fact that the attachment of the brush holder to the brush plate is improved, since on account of the increase in height caused by the bending and return of the attachment lug, more melted material contributes to the attachment for each attachment lug.
Number | Date | Country | Kind |
---|---|---|---|
10 2005 053 020.6 | Nov 2005 | DE | national |
This application is a U.S. national stage application of International Application No. PCT/EP2006/067565 filed Oct. 19, 2006, which designates the United States of America, and claims priority to German application number 10 2005 053 020.6 filed Nov. 7, 2005, the contents of which are hereby incorporated by reference in their entirety.
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/EP06/67565 | 10/19/2006 | WO | 00 | 9/22/2008 |